Pros:

None

Cons:

Not enough ammo spawns, even on Easy, until later in the campaign.

Too long of a Gauntlet to get through when tripping the alarm on the door to get to the first safe room. Adding a Tank to that is overkill, IMO.

A.I. of the bots leaves much to be desired.

Conclusion:

Too hard with just Bots if you're playing by yourself, EVEN ON EASY!!!

I play official maps on Normal and Advanced all the time, so I'm no n00b. There's something really wrong when you can't even get past the stage where you have to make it to the first safe room after tripping the door alarm when playing by yourself with bots.